Tool-holder.



N0. 632,8). Patented Sept. l2, I899. F. A. ERRINGTON.

TOOL HOLDER.

(Application riled Apr. 29, 1597.,

(No Model.

Uivrrnn STATES l' arnn'r UFFICEQ FRANKLIN A. ERR-INGTON, OF NElV YORK, N. Y.

TOOL-HOLQER.

SPECIFICATIONforming part of Letters Patent No. 632,810, dated September 12, 1899.

Application filed April 29, 1897. Serial No. 634,378. (No model) To (all whom, it may concern:

Be it known that I, FRANKLIN ALFRED En- RINGTON, a citizen of the United States, residing in New York, (Stapleton, Staten Island) State of New York, haveinvented certain new and useful Improvements Relating to Tool- Holders, of which the following is a specification.

Reference is to be had to the accompanying drawings, forming part hereof, wherein- Figure 1 is a side elevation of a mechanism embodying my invention. Fig. 2 is a vertical cross-section of Fig. 1. Fig. 3 is a horizontal cross-section on the line A A of Fig. 2, showing a plan view of the internal parts. Fig. 4 shows Fig. 3 with the cover of the body removed and a partly-sectional view of the socket-piece. Fig. 5 is a variation in the construction adapted for conditions under which the center piece is inaccessible from the rear.

In the application of my invention herein illustrated a body 1 is shown, provided with an axial bore 1 meeting a transverse bore 1". A center piece 2 is preferably provided with a tapering end, said center piece being located in the inner portion of said axial bore 1. I have shown a spiral spring 2, Fig. 5, to move said center piece longitudinally relatively to the body 1 and a check pin or screw 2 to regulate said independent movement within desired limits and to prevent said center piece escaping from the socket 1 Fig. 5; but where the center piece is accessible from the rear, Figs.1, 2, 3, and 4, I preferably provide the center piece 2 and its axial bore with screwthreads 2 and place said screw-threaded parts in a cover 1, suitably secured to the body 1, by which construction the transverse bore 1 is provided with top and bottom plane surfaces at right angles to the axis of the body 1.

A frame 3 may be suitably connected with any driving means, say by the shank 3 and clutch-bores 3 It being desired to move the body 1 along the frame 3, I have shown said parts screw-threaded to mesh with each other and have preferably interrupted the threaded portions of each by cutting segments off the periphery of the one and slots 3 in the side walls of the other, thereby securing parallel unthreaded portions,the width of the threaded portion of said body being preferably less than the width of the slots 3, whereby the independent longitudinal movement of said body relative to said frame can be quickly effected by freely sliding the parts along each other and then turning the body half-Way around to connect it longitudinally with the frame at the point desired.

A socket-piece 4 is provided, with a socket 4 and jaws 5 6, both of said jaws being preferably shown movable along their bearings, the pins 5 6 preventing said jaws turning in said bearings, thereby keeping the alining faces 5 (3 of the jaws parallel. The top and bottom surfaces of the socket-piece 4 are preferably plane surfaces at right angles to the alining faces 5 6 of the jaws. The clamping-screws 7 S actuate the jaws 5 6 toward each other.

In the construction herein shown and described the driving and centering means perform theirrespective functionsindependently of each other-that is to say, the socket-piece 4 preferably has no movement along the axis of body 1, said body and socket-piece being relatively immovable longitudinally-and after the tool 9 is gripped in said socket-piece the relativelongitudinal movement of center piece 2 serves to firmly center and aline said tool and to prevent transverse movement of socket-piece 4 in body 1, whereas should said center piece be rigid in body 1 there would be great difficulty in securing said tool in a central and true position without incurring considerable slack movement while gripping it. Complicated constructions of limited capacity have heretofore been deemed necessary to take up this slack movement left after the tool has been gripped; but the relative longitudinal movement of center piece 2 takes it up automatically by asprin g 2 or positively by screw-threads 2. The normally-i m movable body and relatively longitudinally-movable center piece also enable my simple device to operate a tap or similar tool requiring to be rotated alternately in opposite directions and permit small as well as large tools to be used in the same device, the center piece 2 descending into the socket 1 to engage and center the smaller tools and rising up in the socket to permit the gripping-jaws to firmly grasp the larger tools.

The operation of the parts is as follows:

The body 1 is screwed into the frame 3 until its bottom threads are clear of the bottom of the slots 3,'whereupon the threads of said body and frame can be held out of mesh and the body be freely moved along the frame to the position desired, when the body is turned to bring its threads into mesh with those of the frame and to bring its transverse bore 1 to register with the slots 3, whereupon the socket-piece 4 is slipped through said slots 3 and bore 1 and locks the body 1 and frame 3 to turn in unison. In this construction,Figs. 1, 2, 3, and 4, it is seen that the socket-piece at is utilized both as a body-driving means and as a tool-driving means, although this is not always the case, as illustrated in the construction shown in Fig. 5; but a distinctive feature of my invention is that the center piece is independent of both the body-driving means and the tool-driving means. A tool or tap 9, havingthe usual center hole 9*, is placed in the socket and gripped between the alining faces 5 6 and the socket-piece 4 is moved transversely until the center hole 9 registers with the center piece 2, whereupon said centerpiece is moved into said center hole, which brings the tool, tap, or shaft in line with the axis of the driving part. Should this center hole be omitted, the center piece could be provided with a concave center in place of the convex center shown.

If it is merely desired to center and drive a tap, the alining features of my device may be omitted and the tap be merely centered between two driving-surfaces without departing from my invention.

Having now described my invention, what I claim is- 1. The combination with a body having a socket to receive a tool and being provided with body-drivin g mea'ns to connect said body with a driving part and with tool-driving means to connect said tool with said body to rotate in unison therewith, of a center piece provided with a tapered center adapted to engage and center said tool, said center piece being movable outwardly along said socket independently of both of said driving means to mesh with said tool, and means independent of said tool-driving means to regulate said outward longitudinal movement of said center piece, substantially as described.

2. The combination with a body having a socket to receive a tool, the inner portion of said socket being screw-threaded, said body being also provided with body-driving means and with tooldriving means, of a screwthreaded center piece independendent of both of said driving means and located in said screw-threaded portion of said socket and having a tapered center adapted to mesh with a socket-piece located in said transverse bore and movable transversely to the axis of said body, a frame, said body being longitudinally movable along said frame, and means to lock said body to said frame to prevent said longitudinal movement,substantially as described.

5. The combination of a screw-threaded frame, a body that is screw-threaded to mesh with said frame and provided with means to receive and center a tool or tool-holder, and means to connect said frame and body to rotate in unison, substantially as described.

6. The combination of a screw-threaded frame provided with a transverse opening, a body that is screw-threaded to mesh with said frame and likewise provided with a transverse opening, and another part located in said transverse openings to prevent the independent rotation of said frame and body, substantially as described.

7. The combination of a screw-threaded frame having a transverse opening, a screwthreaded body to mesh with said frame and having an axial bore meeting a transverse opening, said body being also provided with axially-located centering means, and a socketpiece to mesh with said transverse openings of said body and frame, substantially as described.

8. The combination of a frame havinga transverse opening and provided with a screw threaded portion interrupted by an unthreaded portion, a body having a transverse opening, and provided with a screw-threaded portion interrupted by an unthreaded portion, and a transversely-movable part to mesh with said transverse openings when the screwthreaded portions of said parts are in mesh, substantially as described.

F. A. ERRINGTON.

lVitnesses:

WM. WHITLOOK, SIMON E. RAHENTS.

IIO 

